Quaternary ammonium compounds



i ntonted Ecol 3%, 1945 UNETED stares ATENT OFFICE more; QUATERNABY mom CQIMGUNDfi Clyde 0. Ecnhe, Wilmington, Del, and .lloaex? PM,

Ilitman, N. Nemours aeration o3 Delaware N o Erawlng.

J., aeslgnors to E, I. do fFont do a Company, Wilmington, met, a oor- Application Magnet 53,

denial No,

l5 Eloisa wherein R is an aliphotic having from 8 to so carbon atoms and X stands for the union of a water-soluble strong acid, import) in this formula deslgnam the molecule or" a tertiary amine, whose limltotione will he more apparent from the discussion hereinbelow.

In British Patent No. 475,170, are described compounds corresponding to the above general formula, except that N terti is defined therein as. embracing pyridine, a fi allryi pyridine or quinollne.- The compounds of this group are characterized by being solids, soluble in water, giwlng solutions which loom readily on shaking, and being useful as agents in textile treatment processes. 'ihey are prepared by reacting on amlclo-methylol compound of the general formula R-CGNHCHzOH with the hydrochloride, or equivalent salt, of pyridine, a C-allryl pyridine or ouinoline. Alternatively, the initial amldo= methylol compound may be replaced by a mixture or the corresponding iatty-acid-amlde (REUNHQ) and paraformaldehyde.

Unfortunately, the above method does not suc= ceeci when applied to a similar synthesis wherein N(tert) is an aliphatic tertiary mine in general. In particular, when the hydrochloride of trlethylamine or triethanol-amine is employed in lieu of pyridine hydrochloride in the above reaction, no reaction whatever is observed under the conditions set forth in said patent. Obviously then, the reaction is not of a. general nature.

It is accordingly an object of this invention to provide a process for preparing quaternary compounds of the above general formula wherein N tert designates the molecule of a tertiary ali-' phatlc amine. By tertiary aliphatic amine for the purpos of this invention we mean an amine in which at least one hydrogen atom is replaced by an aliphatic radical, while the other two hy drogen atoms are replaced by individual alkyl or aralkyl radicals or by the radical of a cycle-aliphatic compound. As typical examples of such tertiary aliphatic amines may be mentioned trimethyl-amine, triethylamine, methyl-diethylolamine, benzyl-dimethyl amine, methyl piperidine and methyl morpholine. Other and further important objects 01 this invention will appear as the description proceeds.

Now according to our invention, quaternary all phatlo ammonium compolmds or the above gen= erel formula are prepared by reectiog with on agent upon a tertiary amino compound 5 or; the general formula 8 to at carbon atoms while In and R2 represent individual alhyl radicals or jointly stand for a cycloaiiphedc radical, as in the case of piperidine or morpholine.

to Moreover, we have found to our surprise that the process of British Patent No. 475,170, above mentioned, although inoperative when salts' of tertiary aliphatic amines in general are con- ,sidered, does proceed with surprising smoothness when applied to tm hydrochloride, or equivalent salt, of a, tertiary aliphatic amine havlng'no more than 5 carbon atoms in its'structure. Typical illustrations of such amines are, for instance, trimethyl-amine, dimethyl-ethylamlne, dimethyiethanol amlne, methyl-diethanol-amine and methyl-morphollne. Accordingly, this observation provides an alternative method for synthesimng compounds of the above. general formula, wherein Nltert) .is a lower aliphatic ter- 3@ tiary amine, that is one having a total of not more than 5 carbon atoms in its structure.

Furthermore, we have succeeded in simplifying considerably the last mentioned process when applied to said lower tertiary amines as defined, 35 particularly as regards to manipulation and choice of solvent.- More particularly, We have found that the reaction in the case of compounds under consideration in'this synthesis may be eflected simply by kneading the reactants together v40 in the absence of any solvent whatever or in the presence of a very small quantity of solvent or of a small quantity of a tree tertiary base which apparently acts as a catalyst and also serves to soften the mass being kneaded.

may apply the modification already indicated in said British Patent 'No. 475,170, in the sense that in lieu of starting with an amido-methylol compound we may use in its place the corresponding fatty .acid amide jointly with paraformaldehyde. The two alternative syntheses last mentioned have the efiect of singling out the compounds of the above general formula wherein N(tert) is I z a lower aliphatic tertiary amine into a particu- Finally, in the synthesis last mentioned, we

.the latter with a soft feel.

Patent 1,952,008 and lar subgroup which may be manufactured with aparticular degree of economy. This subgroup may be defined by the more limited formula wherein R. and X have the same significance as above, while R1 and R2 individually represent methyl, ethyl, ethanol .or jointly represent the morpholine radical solids, soluble in warm water to give solutions which foam readily on shaking. Addition of alkalis to such solutions, however, decompose the novel products, causing precipitation of some solid materials which are no longer soluble in water. When applied to textile fiber, they endow But the most outstanding and commercially important characteristic of our novel group of compounds is that when textile fabric, especiallycotton, is impregnated with these compounds from aqueous bath, then dried and exposed to an elevated temperature (from 100 to 170 C.) in an oven with rapid air circulation, the fabric acquires a water-repellent finish which is permanent in the sense that it is not readily removable by laundering in the presence of soap and alkali. By this characterlstic our novel compounds can be readily distinguished from other quaternary-ammoniumderivatives of related structure except having a longer alkylene radical between the two nitrogen atoms.

Considering now the above indicatedprocesses in greater detail, the first mentioned process involves reaction between a compound of the general formula R2 and an alkylating agent. The radical RCONH represents the radical of a fatty acid amidewhich may be selected from any of the long chain fatty acids, for instance those containing from 8 to 20 carbon'atoms in their structure. As 'particular illustrations of such fatty acids'may be mentioned stearic acid, oleic acid, palmitic acid, lauric acid, or the fatty acids of coconut oil, palm oil, cottonseed oil or tallow, or the derived acids such as those obtained fromhydrogenated fats. R-CONH may also radical, for instance the radical of stearoyl urea, CrzHasCONH -CONH.

As examples of R1 and R2 may be mentioned methyl, ethyl, propyl, ethanol or any other short chain aliphatic radical, that is, one having less than 4 carbon atoms. R1 and R2 may also repre- As alkylating agents, any of the known alkylating or aralkylating agents may be used, for instance dimethyl sulfate, methyl iodide, methyl chloride, benzyl chloride, chlorhydrine, ethyl chloro-acetate. The reaction usually proceeds at room temperature. High temperatures should be avoided because of the sensitivity of these. compounds.-

With reference to the alternative processes mentioned in connection with the lower tertiary aliphatic amines, this reaction may be expressed by the equatio wherein R, R1, R2 and X have the same significance as above. The reaction may be carried out in a solvent such as benzene, ethylenedichloride or methyl-ethyl-ketone. The temperature of the reaction in this case may be between and C.

The presence of a free tertiary base is not necessary for the reaction.- A small amount of such free tertiary base, however, is beneficial in that it acts as a catalyst and improves the quality of the reaction product, especially when, above, the amido methylol compound is replaced by a mixture of the free amide and paraformaldehyde.

Tertiary-amine-salts suitable for this reaction are, for instance, the hydrochlorides'or hydrobromides. of dimethylethylamine, trimethylarnine, dimethyl ethanol amine, methyl diethanol amine and methyl-morpholine. It appears that the nitrogen atom must contain at least one methyl group if the salt thereof is to react satisfactorily with the amido-methylol compound. As

fatty acid amides or amido-methylols for this reaction, the same variation is permissible as in the synthesis first mentioned above.

As already indicated, the alternative process hereinabove described may be carried outeither p in the complete absence or in the presence of only designate an acyl-ureido,

sent jointly the penta-methylene radical, as in a small amount of a solvent, using a rotary dough mixer, This process means a considerable saving in the production of these products, as only a single operation is necessary. It also avoids filtration and recovery of solvents.

The process in-this case is carried out by mixing molecular proportions of the methylol-amide and the tertiary amine salt at a temperature of 50 to C. in a kneading machine of the Werner and Pileiderer type. The reaction temperature is chosen so that thorough mixing is assured during the reaction. The dry reactants, that is the methylol-amide and the tertiary amine salt (or in the alternate method, the amide, paraformaldehyde and the tertiary amine salt) are mixed thoroughly and heated until a plastic mass results. The temperature at which the mass becomes soft will depend greatly upon the melting point of the fatty-acid amide used. After the mass has become soft, the reaction temperature may be lowered, as long as the mass remains plastic enough to assure good contact between the reacting compounds. In order to obtain the best results, it is advisable to have an excess of the aldehyde and of the tertiary'amine salt present. The excess of each of the two ingredients may vary from a few percent to two and three times the molecular quantity. A small amount of free tertiary base is also advantageous during as is indicated.

water. The filtrate of this aecaece trimethylamlrie, triethauolamine, trlbutylamine, methyl piperidine, and homologs of pyridine. A small amount of a solvent may be employed during the reaction. This tends to lower the vis cosity of the reaction mass, thus enabling one to carry out the reaction at a lower temperature. This is an advantage, because temperature above 100 C. tend to decompose the quaternary ammonium compound formed in the reaction. Suit able solvents for this purpose are methyl-ethyl lietone, diethyl-ketone, glycerine, ethylene-glycol and other inert liquid, organic compounds, The time required for this reaction is from 2 to 12 hours, the best product being obtained after ahout hours.

In order to take up the water which is formed during e reaction, an arihydrous like lurn. sulfate or magnesium sulfate be addat the beginning or during the reaction. The s Aer may" be made of iron, stainless steel or clrel, or it may be lined with a more resistant metal, such as silver, tantalum or chromiiu'a.

Without limiting our invention to any particular procedure the following examples which parts by weight are given. serve illustrate our preferred mode operatioh,

Example Z,- parts of stearamido metliyl di methylarrine (which be l lensing stearamide with iormaldehyde roethylamine) are suspended "l5 ethe: cooled to about -3G 32, and it o1 liquid methyl chloride are added. This is warmed in a pressure vessel for five houl" 4% 0. Upon removal the solvent, a soluble product is obtained which dissolves in warm water to a somewhat cloudy solution, hav hi formin properties, It dissolves also in l ethyl. alcohol, methyl-ethyl-ketone hers zene, The reaction product is believed he steeramido-rnethyl-trimethylammonium chloride, of the formula C17H:5 (;3I-NH C HFDNCHE): When the aqueous solution of ti pro-duct is made alkaline with a base like sodium carbonate or sodium hydroxide, a precipitate formed which is insoluble in neutral oracidliied precipitatehas lost all its foaming characteristics. v

If cotton material is impregnated with an aqueous solution of this product and then heated to a temperature between to 17d 6; iii an oven with rapid air circulation. the material acquires a water-repellent finish which is permanent in the sense that it is not removed by laundering in the presence of soap and alkali.

Example 2.To a'solution of 17 parts of steer- 'amide-methyl-dimethyl-amine in ace parts of ether, are added 5 parts of methyl iodide, and the clear solution is allowed to stand at room temperature. After a short time the solution becomes turbid and a slightly yellowish product can be filtered 06 which dissolves in warm water, to a viscous solution. It dissolves also in methyl alcohol and methyl-ethyl-ketone, like the product described wards inorganic bases is also the same. -The product is believed to be stearamido-methyl-trimethyl-ammonium-iodlde, having, most likely, the following formula:

in Example 1.' Its behavior to chloride are used.

Example 3.--i? parts of stearamidomethyl-di= methylamlne are dissolved in ace parts of ether, and 7 parts oi dimethyl-suliate are added. After standing at room temperature for a short time, a white reaction product separates out which dissolves in hot water to a clear solution. The prod= not is most probably stearamido-methyl-trimethylammonium-methyl-suliate.

Enamels 4-18 parts of stearamidomethyl-dimethylamine are dissolved 2% parts of and?) parts ethylene-chlorohydrine are added, Upon standing room temperature for days, a cohsiderable amount of crystals separate which are soluble warm water. s product is probably steer dildo-methyl-dimethyl-ethyloie ammonium Example oi ethylene chloi driue mentioned, 7,6 of hen compound is to. group t ably the? solution, v

stearamico -me H W parts of l oarts dimethyl were eafter s" for a slew hours room to ture, was removed icy even The residue dish.) Jed in water to give a s foaming, clear solv'ion. The product is to stearamido ethyl diethyl metl monium-(methyl su The products of Examples to i alcove celiulosic fiber water repellent, if the latte pregriated with an aqueous-solution o; products and then dried ll'i an even rs, air circulation. ale-$ mixture or parts amide methylol, (CE'ImECUlVL L PGZ'LQQI'Z parts of trimethylarnine hydrochloride, and dill; parts of etluzlene-dichlorlde, are heated for it? lioursto 60 Ci,- The solution is filtered while hot, and the filtrate is allowed cool. the

white product which separates from the filtrate pregnated therewith and heated to a tempera l- 7 oil acids, or oleic acid.

ture of 100 to C. in an oven with rapid air circulation.

' Instead of the methylol-stearamide, the methylol compounds of other amides or mixtures of amides may be used, for instance, the ones obtainable from coconut oil acids, the fish Example 9.A mixture of 54 parts of stearamide, 20 parts trimethylamine hydrochloride, 6.6-parts o1 paraformaldehyde, and 5 parts of triethylamine, are heated in 400 parts of ethylene-dichloride for 24 hours to 60" C. After this time the mixture is filtered hot and the filtrate is cooled. The white crystalline product which separates out is filtered off and washed with acetone. It emulsifies well in hot water, has foaming properties, and imparts water-repellent properties to cotton textile, fast to washing, when applied as described in Example 1.

Example 10.-60 parts of methylol-stearamide are mixed with 400 parts of ethylene-dichloride and 47 parts of methyl-morpholine hydrochloride. The mixture is heated to 60 C. for 24 hours. Upon cooling. 93 parts of a white product is obtained which dissolves in warm water and has strong foaming properties. It probably corresponds to the formula 011F011; C 17H35C ONH-C lIz-N CHeC Hz If the methyl-morpholine-hydrochloride in the above reaction is replaced by '43 parts of dimethyl-ethylol-amine hydrochloride, a product is obtained which probably has as its main constituent stearamidomethyl-dimethyl-ethylol-am monium chloride.

Example 11 .52 parts of trimethyl-amine and 32 parts of hydrogen chloride were passed into 300 parts of methyl-ethyl-ketone at room temperature; then 134 parts of stearamide and 21 parts of paraformaldehyde were added. The whole mass was heated for 8 hours to 75 to 80 C. During the reaction a slight excess of tri- (methylamine was maintained. Upon cooling down to'room temperature, a white product was obtained which dissolved in warm water and which imparted permanently water-repellent properties to cellulose when the latter was impregnated with an aqueous solution thereof and then heated for a few minutes to 120 C. in an oven with rapid air circulation. The product is probably identical with that obtained in Example 1.

Example 12.-221 parts of stearamide and 36 parts of paraformaldehyde were suspended in 720 parts of methyl-ethyl-ketone and then a small quantity of trimethyl-amine was added, silfiicient to make the mass alkaline to brilliant yellow. The mass was then heated for 14 hours to 75 to 80 C. After cooling down to room temperature, more trimethyl-amine was added, until a total of 115 parts have been absorbed. Hydrogen chloride gas was passed in at the same time until 60 parts were added. Then the reaction mass was heated again for 6 hours to 75 to 80 C., keeping the reaction mass slightly alkaline to brilliant yellow'all the time. Upon cooling and filtering. an almost colorless product 'was obtained which dissolved in warm water and which had the same properties as the product described in Example 1.

Example .13.-59 parts of trimethylamlne were passed into 800 parts of ethylene-dichloride at a temperature around C. Then hydrogen chlo-v Example 14.-30 parts of methylol-stearamide were suspended in 250 parts of ethylene dichloride, then 14.6 parts of dimethyl-ethyl-amine-hydrochl oride and 0.2 part of triethylamine were added. After heating for 10 hours to C., the ethylene dichloride solution was filtered warm, and the filtrate evaporated to dryness. The residue was soluble in water and had strong foaming properties. It is believed to be stearamidomethyl-dimethyl-ethyl-ammonium chloride.

Example 15.9.8 parts of stearoyl urea (C1'1H35CONH-CONH2) melting at 178 C. is suspended in 125 parts of ethylene dichloride and then 2.2 parts of paraformaldehyde, 5.5 parts of dimethyl-ethyl-amine hydrochloride and 0.4

part of triethylamine are added. After stirring for a few hours at 60C., the otherwise exceedingly insoluble ureide becomes water-soluble.

The aqueous solution possesses strong foaming properties and renders cellulosic material water repellent when the latter is impregnated with this solution and dried in an oven with rapid air circulation at a temperature of 120 to 150 C. The reaction product is believed to be stearoureido-methyl-dimethyl-ethyl ammonium chloride, of the formula i can-arc0Nnco1 n-cmNcan CH: CH;

Example 16.-A mixture of 54 parts of stearamide, 20 parts trimethylamine hydrochloride,-

and 10 parts of paraformaldehyde, are heated to between 50 and 100 C. while being mixed intimately for five' hours. The reaction product is water-soluble and has pronounced foaming properties. When cotton is treated with an aqueous solution of this product as described in Example- 1, it becomes permanently water-repellent. A small amount of a free tertiary base like pyridine or triethylamine may be used in the above example as a catalyst.

Example 17. parts of stearamide, 36 parts of trimethylamine hydrochloride and 12 parts of paraformaldehyde were intimately mixed in a rotary dough mixer and then 3 parts of pyridine were added. The whole mass was heated to between and C. for 8 hours. After cooling down to room temperature, a waxy solid was'obtained which could be converted into a granular product when mixed with sodium sulfate or magnesium sulfate. Otherwise, the product appeared to have the same properties as that in Example 1.

Example 18.--54 parts of stearamide were mixed in a rotary dough mixerfor five hours to so to c. with 30 parts of trimethylamine hyrid'e gas was passed in until the mass was acidic to litmus paper. To this finely divided trimethylamine-hydrochloride suspension, parts of methylol-stearamide were added and the mixture was heated to 60 C. for 16 hours. to room temperature, a white product was obtained which dispersed well in'warm water, and resembled otherwise the product obtained in Example 1.

Upon cooling drochloride, 12 parts of paraformaldehyde, and 24 parts of dry magnesium sulfate. The reaction product was a hard mass when cool, and could be readily pulverized. The active ingredient in this product was probably the same as describedin Example ,1.

Example 19.-,65 parts of stearamide were mixed in a rotary dough mixer with 36 parts of trimethylamine hydrochloride, 12 parts of paraformaldehyde, 15 parts of glycerine, and 1 part of pyridine for 5 /2 hours at a temperature of 85 to 88 C. The reaction product showed improved solubility in water over that described in the preceding examples,'but seemed otherwise identical therewith.

Example 20.-64 parts of stearamide were mixed in a rotary dough mixerwith 10 parts of parafor'maldehyde and 45 parts of methyl-diaaosseo ethylol=amine hydrochloride for four hours to do to 90 C. A waxy solid was obtained Winch dis persed well in warm water, but had otherwise the principal properties as the product de scribed in mample 1, including the power to ite 5 past waterqepellencyo compound formed is believed to be a customary compound oi the Example 2I- i" 2 of 56 parts stearamide, parts tzimethylamlne hydrochloride, 8 parts paraiormaldehyde 2 parts oi pyridine 15 are mixed in a heavy duty mixer at so to loll" for a period of Evto ill hours. On coo g mass-breaks up into small particles which ions.

a cloudy solution with warm water. Tjoe product is sl'ibsta tialiy identical the preceding examples, By treatment of cott cloth the solution as described ced ng examples, it is made permanently we repeilent,

In the above example pyridine placed with triethylan'ine, trimethylamine, ethanolamine and other? tertiary swim a Ecccmgcie 22.A mixture of 58 parts SlZGZlEEElEL parts trimethylamine hydrochloride 5 paraformaldehyde and 19 parts a 2il% Milk 3@ tion of tiiniethylamine' in methyl-ethyl hetone is mixed in a heavy duty mixer at to .illt C, i period of 5 ill hours. On cooling product biuaks up into small particles which disperse well in watea'and appears to be identical with the product obtained preceding examples.

lieu of the lower tertiary aliphatic amine hydrochloride employed in Examples t to elusive, other salts of the with strong, monobasic acids may he et for instance, thimethylammoniiun nit trilpethyl ammonium salt of meta-mole smioric acid,

It be understood that many other varia tions and modifications, may be made in the do tails of the procedure without departing from the sic and scope of this invention ct the purpose of this application and the claims hereinbelow, the phrase "soluble in Willi Tl water or dissolving warm slate? shall be understood as implying a solubility oi at least 2 Sins. of substance per 10c cc. of wateetalsen at a temperature of about 49 6., these being re spectively meal the higher concentration and about the average tempei'atuie oi the aqueous bath employed in practice quotes nary ammonium compounds of this general are used for treating fabric for water-iepelleecy purposes. See for instance British Patent No. sweet. 6

e clam:

l. A compound of the general formula MONH-CH2-N (tort) X wherein R is an aliphatic radical containing from 8 to 20- carbon atoms, X stands for the anion of a monobaslc,'water-solubIe acid, "while N (tert) designates an aliphatic tertiary amine having at least one methyl radical attached to the' N-atomf said compound beins characterized by dissolving in warm water to give a foaming solution which is unstable toward alkali but which when applied to cotton fabric followed by heating the latter in an oven with rapid air circulation-imparts to said fabric obtained N may re a watei i'epellent finish substantially fast to laundering.

2. A compound of the general formula 2 a coma CH7NH2 B2 wherein R stands totals aliphatic radical having from t to 20 carbon atoms, 2 stands for the anion. 01" a monobasic, water-soluble acid, while R1 and R2 represent aliphatic radicals having jointly not over carbon atoms, said compound being characterized by dissolving in warm water to give a foaming solution which is unstable to= ward alkali but which when applied to cotton fabric followed by heating the latter in anoven with rapid all circulation imparts to said fabric a Wateoiepelleut substantially fleet laundering. V 3. A compound of the general ioimula' l T a-c oNH-on'r-Ir c& OLE

C Wheiein R is an aliphatic radical eontai stress 8 to as carbon atoms, While 23 stands the anion of a mono'ioasic Watensoluble acid compound being characterized by dissolving; warm water to give a foaming? solution is unstable toward alkali but which when to mil/3933, fabric followed heating the in an oven with rapid ci cula fast to island a conipoiuoa wherein R an aliphatic z adical Won 1. ii to as carbon atoms, while a halogen atom, said compound be character= ized by dissolving in warm Watei to give a teaming solution which is unstable toward which when applied to cotton fabric oil-owed as heating the latter in an oven with rapid air cir= culation imparts to said fabric a watez' repelleiit finish substantially fast to latmdeelnsu I 5. Stearamldo methyl trim-ethylammonim chloride, 1

6. Stearamido' methyl dimethyl ethylol= ammonium chloride. r

l. A process of producing compound oi the general formula x R c oNn-osrit ons R2 wherein R stands for an aliphatic iadicalhaviua from $3 to 20 carbon atoms -X stands for the anion of a monobasic, water-soluble acid, and R1 and R2 represent lower aliphatic radios-la haw ing jointly not over 4 carbon atoms, which com prises reacting together an amido-methylol compOund of the general tormtflaR-CONHH:Ol-lv wherein R has the some significance as above, with a. salt of a tertiary amine of theigeneral formula aP-N HX R1 R1 wherein R1, R2 and X have the samesignificance as above, in the presence of a. tree tertiary base.

8. A process as in claim-7, wherein the amide methylol compound is formed in sltuby the interaction of a fatty-acid amide of the general formula R-CONH2, wherein R-has the same significance as above, with a reagent yielding formaldehyde.

9. A process as in claim 7, the reaction being effected by kneading the reagents together in the absence of any quantities of solvent which would be sufiicient to form a liquid suspension of the reaction mass.

10. A process of producing a quaternary ammonium compound of the'general formula wherein R stands for an aliphatic radical having from 8 to 20 carbon atoms, which comprises kneading together in plastic state and at a temperature between 50 and 90 C., a mixture of a methylol-amide of the general formula RCONH-CH20H wherein R has the same significance as above, and trimethyl-amine-hydrochloride.

11. A process of producing a quaternary ammonium compound of the general formula wherein R stands for an aliphatic radical having from 8 to 20 carbon atoms, which comprises kneading together in plastic state and at a temperature between 50 and 90 C., a mixture of a fatty-acid amide of the general formula R-CONH2, wherein R has the same significance as above, paraformaldehyde, and trimethylamine-hydrochloride.

12. A process as in claim 10, the kneading being aided by the presence of an inert diluent in quantity insuflicient to dilute the mass beyond the plastic state.

13. A process as in claim 10, the reaction mass containing further a catalytic quantity of a liquid tertiary base. v

14. A process as in claim 11, the kneading being aided by the presence of an inert diluent in quantity insufllcient to dilute the mass beyond the plastic state.

15. A process as in claim 11. the reaction mass containing further a catalytic quantity of a liquid tertiary base.

CLYDE 0. HENKE. JOSEF PIKL. 

